2 CPU-95 DIGITAL IGNITION SYSTEM 1.0 SYSTEM DESCRIPTION 1.1 The Altronic CPU-95, DC-powered ignition system is a microprocessor-based capacitor discharge system designed for application on natural gas fueled engines. The system features crankshaft-triggered timing accuracy and the capability to vary timing electronically by several means, including an external 4-20 ma control signal connected to the optional Display Module. The system is fieldprogrammable and offers a variety of advanced control methods, emissions reduction, primary and secondary spark diagnostics, self diagnostics, serial communications and engine protection features. 1.2 The CPU-95 ignition system consists of two main parts: an optional user interface Display Module and an engine mounted Ignition Module (SEE FIGURE 1). The optional Display Module has an alphanumeric back-lit LCD display that shows the operating status, engine RPM, energy level, single or double-striking mode, current loop input value, ignition timing, set-up, and diagnostic information. The Display Module is a means of monitoring or changing monitored parameters, all of the ignition system functions are performed in the Ignition Module. Five models of the Ignition Module are available: outputs, single storage capacitor outputs, single storage capacitor outputs, single storage capacitor outputs, dual storage capacitors outputs, single storage capacitor (VariSpark ) 1.3 Timing changes on the CPU-95 are derived by counting pulses from the reference teeth. The timing change increment is dependent on the number of holes or teeth being sensed. The minimum timing change is defined as follows (where N = number of holes or teeth): If N < 270, then increment = 45/N degrees. If N > 270, then increment = 90/N degrees. 1.4 Power requirement is 24 Vdc, 5 amperes nominal for typical applications (10 amperes for systems using the Ignition Module). REFER TO FORM CPU-95 II, SECTION FORM CPU-95 SI 4-08

8 CPU-95 DIGITAL IGNITION SYSTEM 3.0 TEST STAND REQUIREMENTS 3.1 In order to test an Altronic CPU-95 ignition system, a special test stand is required. The basic test stand is similar to that required for the Altronic CPU-90 system. 3.2 The following items are required to test the Altronic CPU-95 system: A. A variable speed motor of 0.5 HP or greater, capable of rotating 1800 RPM with a standard ignition drive accepting either flange or base mounting. B. A spark degree wheel graduated in 360 increments with the indicator attached to the shaft common to the standard ignition drive. C. Sixteen (16) ignition coils connected to suitable, adjustable spark gaps. NOTE: THE TEST STAND SHOULD INCORPORATE EIGHTEEN (18) IGNITION COILS IF 18-OUTPUT UNITS WILL BE TESTED. D. A source of gear tooth pulses mechanically connected to the ignition drive; a 180-tooth gear is recommended. E. A single reset pin (6-32 steel machine screw recommended) mounted to the face of the gear. F. Magnetic pickups ( x) mounted to sense the gear teeth and the reset pin. G. A primary wiring harness connecting the ignition coils to the CPU-95 Ignition Module. This requires connector MS3108A-22-14S, Altronic part number NOTE: THE HARNESS IS WIRED DIFFERENTLY FOR 18-OUTPUT UNITS. H. A manual control loop unit to simulate the 4-20mA control signal. I. A DC power source capable of supplying 24Vdc, 5 amps (see Installation Instructions form CPU-95 II, section 9.2 and drawing ). J. An Altronic II-CPU Alternator; part no H is recommended. A distributor shaft assembly with 2:1 gear installed is required to test a 4-cycle application. The rotating magnet on the distributer shaft assembly must be over the Hall-effect switch when the reset pin on the test stand is opposite its magnetic pickup. K. An Altronic II-CPU back cover assembly or -2 and mating harness Connect the wiring harness as shown on the following page. L. A blank CPU-95 EEPROM, Altronic part number A. Test memories can be used if the Terminal Program is not used. Test memories for 16 and 18-cylinder, 4-cycle applications programmed with the number of teeth used on the test stand (usually 180) will be needed. M. Altronic CPU-95 Terminal Program part number CPU-95.MEM. NOTE: REFER- ENCE FORM CPU-95 PI, SECTION 1.3 FOR COMPUTER AND PERIPHERAL REQUIREMENTS FOR THE TERMINAL PROGRAM. N. A means to elevate the CPU-95 Ignition Module to a controlled temperature of 150 F (65 C). O. Altronic Test Unit can provide simulated pickup signals to exercise the CPU-95 outputs at a fixed firing rate. P. CPU-95 Display Module can be connected using a 4-conductor cable as shown in the Test Stand Wiring diagram. NOTE: SUPPLY POWER TO THE DISPLAY MODULE BY CONNECTING TWO OF THE FOUR CONDUC- TORS TO THE CPU-95 INPUT POWER TERMINALS. IF A SEPARATE SUPPLY IS USED TO POWER THE DISPLAY, THE GROUNDS MUST BE AT THE SAME POTENTIAL FOR PROPER OPERATION OF THE RS485 COMMUNICATIONS. 8 FORM CPU-95 SI 4-08

10 CPU-95 DIGITAL IGNITION SYSTEM 4.0 TESTING PROCEDURE - CPU-95 IGNITION MODULE 4.1 VOLTAGE OUTPUT TEST: Using a known good Display Module, connect CPU-95 unit to test stand. REFERENCE FORM CPU-95 II FOR CORRECT WIRING OF UNIT AND CPU-95 OI FOR OPERATION OF UNIT. Set the Ignition Module for energy level 2 (E2). Operate the test stand at 300 RPM leaving the 19-pin output connector disconnected. Output voltage is measured from the G pin (+) to the J pin ( ). The output voltage should be 160 ±10 Vdc. 4.2 OPERATIONAL TESTS: With the system completely connected, perform the following tests on the Ignition Module. It is recommended that these tests be performed with the Ignition Module heated to a temperature of 150 F (65 C). The tests should be performed using a test EEPROM having the same number of teeth as the test stand, or program a blank EEPROM. A. 180 TOOTH GEAR RPM TEST 75 RPM All outputs fire a 15mm gap. 600 RPM All outputs fire a 15mm gap RPM All outputs fire a 15mm gap RPM Each output fires consistently in sequence; timing as follows starting with output A and proceeding in alphabetical sequence: 8-OUTPUT: A-B-C-D-E-F-K-L H4A180.FC OUTPUT: A-B-C-D-E-F-K-L-M-N-P-R-S-T-U-V P4A180.FC OUTPUT: A-B-C-D-E-F-G-H-K-L-M-N-P-R-S-T-U-V R4V180.FC NOTE: Perform remaining tests B. through G. at 1200 rpm. NOTE: This test is only valid with 8 and 16 output Ignition Modules; there is no connection to the storage capacitor in 18-output units. NOTE: Do not program over the original EEPROM. A P4A180.FC pattern is recommended for a 16-output unit and a R4V180.FC pattern for an 18-output unit, assuming the test stand uses a 180 tooth gear. B. The Display Module should read FIRING. The panel I/O switches should be as follows: Alarm Out - closed; Fault Out - closed; Fire Confirm Out - closed. C. The four internal LED s on the logic board should be as follows: Power - on; Rx - flashing; Tx - flashing; Alarm - off. D. Verify cylinder spark data number reads in accordance with form CPU-95 OI, SECTION E. Verify cylinder spark data number reacts in accordance with form CPU-95 OI, SECTION When the diagnostic flag is set the alarm out I/O switch on the panel should open and the Display Module should read WARNING VIEW DIAGNOSTICS. Verify that the proper warning and output identifier was captured (press DIAG key on Display Module). F. Ground the shutdown lead G (8 and 16 output units only). Ignition firings should immediately cease and the display should read SHUTDOWN. The panel I/O switches should be as follows: Alarm Out - closed; Fault Out - closed; Fire Confirm Out - open. G. Ground the Shutdown Input (all units). Ignition firings should immediately cease and the display should read SHUTDOWN. The panel I/O switches should be as follows: Alarm Out - closed; Fault Out - closed; Fire Confirm Out - open. 10 FORM CPU-95 SI 4-08

11 SEE FORM CPU-95 OI, SECTIONS 5.0 AND TIMING TESTS: The following tests should be performed on the Ignition Module to verify proper control of timing. Use a test Display Module. A. Enter the TIMING menu and test the GLOBAL RETARD. Vary the global timing and verify the timing changes on the spark wheel and on the Display Module (SEE FORM CPU-95 OI SECTION 5.0). B. Enter the TIMING menu and test the ONE-STEP RETARD. Ground the miscellaneous input and assure the timing retards by the one-step retard value (SEE CPU-95 OI SECTION 6.4). C. Enable CURRENT LOOP RETARD and test the 4-20mA CURRENT LOOP. Vary the input current by adjusting the connected to the Display Module and assure the timing changes in accordance with the unit s programmed curve (SEE CPU-95 OI SECTION 6.2). 5.0 OHMMETER CHECKS SEE SECTION IGNITION MODULE POWER BOARD: The following tests should be made using a Simpson Model 260 analog volt-ohmmeter (VOM) set to ohms. The ohmmeter scale should be set to R x 10,000. Readings outside the range indicated establish a defective Power Board. A Power Board passing the ohmmeter tests may still be defective and the full test should be performed using an oscilloscope to confirm correct operation. A. Check the resistance with the positive lead of the ohmmeter connected to the G lead and the negative lead connected to each output pin of the output connector. If ohmmeter reading is less than 250,000 ohms replace Power Board (2-14). B. Check the resistance with the negative lead of the ohmmeter connected to the G lead and the positive lead connected to each output pin of the output connector. If ohmmeter reading is less than 250,000 ohms replace Power Board (2-14). NOTE: THE J LEAD IS NOT AN OUTPUT PIN. 6.0 OSCILLOSCOPE TESTS 6.1 TEST SET-UP: Two 100:1 oscilloscope probes are required. Test speed is 1000 RPM. 6.2 STORAGE CAPACITOR VOLTAGE PATTERN (8 and 16 output units only) A. Connect he trigger input of the oscilloscope to the A primary coil lead. NOTE: This is a 140 to 180 volt, positive polarity signal. B. Connect the oscilloscope reading probe to the G lead to view all outputs. SEE NORMAL PATTERN ON NEXT PAGE. C. Verify peak output voltage is: 140±10 volts for energy level E1 160±10 volts for energy level E2 180±10 volts for energy level E3 6.3 MULTI-STRIKE TESTS ( and series only) A. Set Unit to MULTI-STRIKE mode via Display Module keypad. B. Verify timing of all outputs using the table in section 4.2 A Series: Verify all outputs have two firings. The separation will vary with rpm and should equal 7 degrees at 1000 rpm. The second firing is automatically turned off above 1050 rpm Series: Verify a longer duration spark on the degree wheel compared to normal mode. C. 8 and 16 Output Units Only: Connect oscilloscope to the G lead and view pattern. Discharge waveform should appear as shown on the next page. 11

12 CPU-95 DIGITAL IGNITION SYSTEM NORMAL PATTERN (ALL UNITS) MULTISTRIKE PATTERN ( X) VARISPARK PATTERN ( X) 7.0 TESTING PROCEDURE - DISPLAY MODULE 7.1 OPERATIONAL TESTS: Connect the Display Module to a test Ignition Module known to be operational. A. Apply 24Vdc input power to both units and verify Display Module communicates with Ignition Module. Display should read READY. B. Hold down ENTER key for approximately six seconds to access keypad test, depress each key and verify that a unique number (0-15) is identified for each key. C. Start rotation of test stand motor and increase speed to 300 RPM. Display should read FIRING. With spark wheel turned on and firing output A at zero degrees, verify current loop operates as programmed and that Display Module shows the correct loop value (4-20mA). D. Ground miscellaneous input on Display Module and verify ONE-STEP timing retards the amount stored in the ONE-STEP timing value. SEE INSTALLATION INSTRUCTIONS FORM CPU-95 II FOR CORRECT WIR- ING AND OPERATING INSTRUCTIONS FORM CPU-95 OI FOR OPERATION OF THE DISPLAY MODULE. NOTE: Ground only the miscellaneous input on Display Module and not on Ignition Module. 12 FORM CPU-95 SI 4-08

13 8.0 TROUBLESHOOTING Perform all tests at a test stand speed of 1000 RPM with a 4-cycle test memory. The following tests assume an adequate 24 Vdc power source and properly installed magnetic and Hall-effect pickups. 8.1 IGNITION MODULE: The following tests are to be performed with a known good Display Module. PROBLEM TEST TEST INDICATION CORRECTIVE ACTION (Fig. 2) No output Section 4.1 No voltage Replace power board (14)* No output Section 4.1 Low voltage Replace power board (14) One output does not fire Only one output fires No Multi-Strike function Panel I/O switches malfunction Incorrect or missing cylinder spark data Unit does not acknowledge SHUTDOWN Section 4.2/6.2 Section 4.2/6.2 Section 6.3 Section 4.2 B, C Section 4.2 D, E Section 4.2 F, G Missing discharge on stand or scope Only one spark gap is firing Outputs do not have second firing Does not function as described Sets non-existent WARNINGS on display, always reads 0 or 255 Unit continues to fire Timing varies Section 4.2 A Timing other than as shown Timing control malfunctions Section 4.3 * May indicate a defective power or logic board. Timing does not change or changes incorrectly Replace power board (14) Replace power board (14) Measure voltage from pin 4 to Vss of large ribbon cable on logic board. If voltage is 5V. in Multi-Strike mode, replace power board (14). If voltage is 4V. or less and Display Module shows Multi-Strike identifier, replace logic board (11) Replace logic board (11) Replace power board (14)* Fails section 4.2 F, replace power board (14) Fails section 4.2 G, replace logic board (11) Replace logic board (11) Replace logic board (11) 8.2 DISPLAY MODULE: The following tests are to be performed with a known good Ignition Module. PROBLEM TEST TEST INDICATION CORRECTIVE ACTION (Fig. 3) No function from Display Module No response from one or more keys No current loop function No One-Step function Section 7.1 A Section 7.1 B Section 7.1 C Section 7.1 D No display or no communications* Missing or wrong key identifier Timing does not change or changes incorrectly Timing does not change * Display Module reads COMMUNICATIONS PROBLEM ** May indicate a defective display board or defective keypad Replace display board (10) Replace display board (10)** Replace display board (10) Replace display board (10) 13

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